Optimal filtration performance: The washable filter ensures optimal dust absorption and ensures a long service life of the QX9. The package includes: 2 washable pre-motor filters, compatible with all QX9 models. Product size: 9.5*6*1.1 cm Note: The data are all measured manually, please allow an error of 1-3 cm due to differences in light and display, there may be color differences, please refer to the actual item received.